Finding the Third Proportional to 59.70 and 90.28

Step by Step Solution

1. Step 1: Write the proportion equation
   59.70 : 90.28 = 90.28 : x
2. Step 2: Convert to fraction form
   59.70/90.28 = 90.28/x
3. Step 3: Cross multiply
   59.70x = 90.28 × 90.28
4. Step 4: Simplify right side
   59.70x = 8,150.70
5. Step 5: Solve for x
   x = 8,150.70/59.70
6. Step 6: Final answer
   x = 136.54